3. Cold-water fish
Eat it for: The omega-3 fatty acids
Examples: Wild salmon, herring, sardines, anchovies, tuna (not more than once per week), rainbow trout, mackerel. Fish-oil supplements are a practical alternative for those who don’t eat these cold-water fish at least three times a week, Reardon says.
Why they help: There’s a reason fish is known as “brain food.” Fatty fish such as wild salmon contain the omega-3 fatty acid DHA, which has been shown to increase the membrane quality and nerve function of gray matter in the brain. Twenty percent of the gray matter in the brain is composed of DHA. Some studies have found that DHA consumption especially increases gray matter in the amygdala, the hippocampus, and the cingulate, three areas of the brain associated with mood. People with severe depression have less gray matter in these areas.
Fish is also a great source of lean protein, which stabilizes blood sugar. Eating small amounts of protein with meals can help keep your mood on a more even keel.